How can I measure RPM?
If you want to display RPM as a guage or text on your scene, then you can measure RPM in one of two ways with Video VBOX, either by reading directly from the CAN bus of your car, or by using the Micro Input module.
The Video VBOX Lite has one CAN input channel, and the Video VBOX Pro has 16 channels. You can connect to your vehicle's CAN bus either by using an optional OBDII connector:
Or if your car doesn't have CAN on the OBD connector (about 50% of modern cars have it), then you can splice directly into the CAN wires, but this takes a small amount of auto-electrician skills.
Each car uses a different protocol, but here at Racelogic we have reversed engineered 99% of the common protocols (and we add new ones each week), so we supply a free database with each unit. We can often supply RPM, Wheelspeeds, Throttle Angle and Brake Pressure, depending on your vehicle. For a list of supported vehicles, have a look at our Vehicle CAN Database.
Micro input module:
Alternatively, you can use the Micro Input Module to take an RPM feed from your ECU, Coil or Injector to capture RPM, throttle angle, brake pedal movement etc.